Feed-water heater.



- R'. o. CAsPBRsoN.

PATENTBD JULY 28., 190s.

FEED WATER'HEATER.. APPLICATION FILED MAR. 21.41907.

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Uivi'TED STATES PATENT oEEicE.

Rasmus' c.' cAsPERsoN, 0F LAKE BENTON', MINNESOTA.

FEED-WATER HEATER.

trates one ofthe embodiments of the inven tion, Figure lis a side elevation of a locomotive boiler showing portions of the feed water heating system in section. Fig. 2 is a vertical transverse section on line 2--2, Fig. 1.

Similar reference characters are employed to designate similar parts in the figures. 4

Referring to the drawing, 1 designates a ,steam generator of the locomotive type which is of ordinary construction 'and provided with a irebox or combustion chamber 2. Located in the .rebox is a feed water heating coil 3 constructed in any approved manner and preferably comprising a conduit bent back and forth a number' of times ywith its upper end discharging into the water space 4 of the boiler and its lower end connected withthe water supply-pipe 5 receiving water from a pump or injector inthe usualmanner. The coi 3 is dis osed ina verticalplane and slightly-spaced om the tube sheet 6 of the boiler so as to permit of the unobstructedV entrance of the re gases intothe boiler tubes. The feed water heating coil is thus located in the 'direct path of theiire ases and at the hottest point so that the fee water is brought up to a high temperature in assage through the coil. -The upper end ofp the coil is connected bya suitable coupling 7,with a short piece of -pipe 8 that passes'thro'ugh the reox sheet 9 and discharges into the water space 4, there being a brass bushing 10 around the short pipe 8 so as to prevent'leaking. The inlet'end of the coil is'similarly attached to a short pipe 11 that extends from the fuebox to 4-a point exterior to the boiler where it is connected' by 'a T-coupling 12 -with the supply pipe 5. v- Inthe ipe 5 is a 'check valve 13 that opens toward t e heating coil and closes toward the source of supply,

.- thus preventing leakage when the pump or igijectoiis not operating. Since the. heatingv coil issubject to a very Specification of Letters Patent. Application led March '21, 1907. Serial No. 363,688.

-tion o high temperature, it is necessary to provide means for maintaining it Lfilled with water; otherwise, the water thereinwould soon turn to steam after the feed water is cut ofand result in thecoil quickly burning out. For this purpose, a safetyl device is employed which comprises a pipe 14 connected at one end with the bottom or water space of the boiler and at the other end with the T 12, there being included in the pipe a checkI valve 15 that opens toward the T and closes toward the water s ace of the boiler. This pipe constitutes a y-pass whereby water can flow into ,the heating coil to take the place of the water that is generated into steam in the coil.

Patented July 28, 1908. frs,

In other words, as long as the Water level in the boiler is maintained above a predetermined limit, the coil 3 will always be=filled with water.v

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and of the method of operation will be readily aparent to thoseskilled in the art to which t e invention appertains.

In practice, the sililpply of water through the pipe 5 tothe boer is o ened when the water level reaches a pre etermined low limit and water passes through the valve 13 'and coil 3 in which it is highly heated and then discharges into the boiler. Since the pipe 14 is equipped with a check valve, it is impossible for t e water to be sup lied directly to the boiler. Afterthe sup y is cut oii, the check valve 13 automatical closes under the pressure in the boiler an as the,

pressure in the water coil tends to vary, due t0 thegeneration of steam therein, this pressure is equalized through the pipe 14.- It will thus be seen that the water can freely flow from `the boiler into the coil 3 and through the latter back into the boiler.

The Water heating device is of simple and inexpensive construction and highly eflicient in o eration.

' aving thus described the invention, what I claim is A feed water heater comprising a boiler with a fire boxtherein having a surrounding water space therebetween, a coiled conduit havin one end connected to the up er orif one of the side walls of the hre ox, and its other end connectedI midway of the opposite side wall thereof, and also connected -to the wall of the boiler, said connected ends of the coiled conduit serving to ioo sup ort the coils approximately near the top #check-valve in said feed-pipe opening toward of t e fire box, and4 disposed in a vertical j plane and 'slightly spaced from the tube sheet ofthe boiler, the openings of'said tube l sheet being` arranged'so as to point between l the longitudinal spaces of t n e coils, said! spaced portion between the-tubel sheet and l e coiled conduit serving to permit of an unobstructed passage of the. re gases int'o said boiler,.a tee connected with the lowerl extremity of said coiled conduit; a feed pipe said conduit; a pipe connected with the other branch of said tee and with the water-space l5 of the boiler, and a check valve in said pipe opening away from the boiler.

In testimony whereof, I affix my signature in presence of two witnesses.

RASMUS C. CASPERSON.

` Witnesses:

v CHAs. E; LnvEssoN,

, `F. E. TUCKER."A 

